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AT WORK
Purito is probably the best 2m RES build-it-yourself model currently available. We now have the latest 2.0 version with many detail improvements. A direct descendant of the Pures and the Slight the Schweiger family concern have optimised the design as far as possible with current (2020) CNC technology. The main design change is to a lower aspect ratio wing to increase the Reynolds Number and give better overall performance and particularly nice handling. Despite the larger wing the weight has been kept the same, resulting in a lower wing loading and excellent performance in weak conditions.
Purito is probably the best 2m RES build-it-yourself model currently available. We now have the latest 2.0 version with many detail improvements. A direct descendant of the Pures and the Slight the Schweiger family concern have optimised the design as far as possible with current (2020) CNC technology. The main design change is to a lower aspect ratio wing to increase the Reynolds Number and give better overall performance and particularly nice handling. Despite the larger wing the weight has been kept the same, resulting in a lower wing loading and excellent performance in weak conditions.
The
The Purito V2.0 flies like a homesick angel and despite its light weight the model has a surprisingly good speed range. As Greg wrote in the RCGroups thread "The big wing bestows a good launch, even when the wind is light; the airplane itself has little drag, so displays very good legs; handling is easy, allowing the pilot to concentrate on thermalling; and finally, the spoilers really make spot landings quite easy."
The amazing wing is the major improvement of this design. The main spar is a substantial carbon tube which gives the structure excellent rigidity. A multitude of ribs are threaded over this tube to give the airfoil shape. This is even better maintained over the critical front portion by utilising two sub-ribs between each full rib, almost eliminating covering sag, and reducing drag appreciably. Becuse the tubular spar is inset below the covering surface there isn't a discontinuity at the spar line which is great feature - this usually trips the boundary layer and causes extra drag.
The kit is beatifully made up with excellently CNC cut balsa and ply parts. The wing is built over/in a 3D jig which ensures all the ribs are perfectly placed and aligned. This can be seen in the clear photos in the Purito German Build Manual. In addition to the manual, full size plans are povided for the tail surfaces. English speakers should refer to the RCGroups Purito thread for detailed build info and Google translate the German text if necessary. Also use Google Translate on this very useful RC-Network.de Purito thread. Before building please checkout this link to the latest manuals and translations.
| Purito V2.0 Specifications | |
|---|---|
| Wing span | 2.0 m |
| Wing area | 39.7 dm2 |
| Length | 119 cm |
| Flying weight from | 440 g |
| Wing loading | 11.1 g/dm2 |
| Aspect ratio | 10.0 |
| Wing airfoil | AG35-38 modified |
| Dihedral (EDA) | 11.0º |
| Centre of Gravity | 75-80 mm from wing leading edge |
| Controls | Rudder, elevator, spoilers |
| Recommended RC | |
|---|---|
| Rudder & elevator servos | Blue Bird BMS-101DMG, Blue Bird BMS-101HV, Blue Bird BMS-A10H, KST X06, Graupner DES 427, ES08 |
| Spoiler servos (2) | Blue Bird BMS-101DMG, Blue Bird BMS-101HV, KST X06, Graupner DES 427, ES08 |
| Receiver | 4 or 5 channel receiver to match your transmitter |
| Battery | Radient 1S 700 mAh LiPo, Dream-Flight 300 mAh 4.8V NiMH, HyperFlight 650 mAh 4.8V NiMH, Dream-Flight 700 mAh 4.8V NiMH, 1S 2600 mAh Li-Ion, 2S 300-600mAh LiPo |
| Control Throws | |
|---|---|
| Rudder | 20 mm each way |
| Elevator | 10 mm up & down |
| Spoilers | 80º - 90º up |
| Hook location | 4 mm from front of cut-out |